William FitzGeoffrey 
William's father was Geoffrey FitzPiers Earl of Essex de Mandeville and his mother was Aveline de Clare. He had a brother and two sisters, named John FitzGeoffrey, Hawise and Cecily. He had four half-brothers and a half-sister, named Geoffrey de Mandeville, William de Mandeville, Henry, William and Maude FitzGeoffrey de Mandeville.
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